8.3 The Central Nervous System SBI4UP MRS. FRANKLIN.

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Presentation transcript:

8.3 The Central Nervous System SBI4UP MRS. FRANKLIN

Nervous System Overview Nervous System Central Nervous System Peripheral Nervous System Brain Spinal CordSomatic Nerves Autonomic Nerves

Grey matter: White matter: The Central Nervous System

The Spinal Cord The spinal cord connects the brain to the rest of the body. All of the peripheral nerves from the PNS connect to the spinal cord. Sensory neurons: Motor neurons:

The dorsal nerve brings information towards the spinal cord through the help of sensory neurons. Whereas, the ventral root send out information from the spinal cord through the help of motor neurons. The Spinal Cord

Neural Reflex Arc

The Brain The brain is the control center of the body. Not only does it control emotion and thoughts, but one of its primary goals is to maintain homeostasis. The brain responds to information relayed form the sensory neurons around the body and send the appropriate messages to specific effectors that can appropriately respond to the changes that have occurred in the body. The brain is separated into 3 main sections: Forebrain, Midbrain, and Hindbrain

The Brain

The Cerebral Cortex Each hemisphere of the cerebral cortex contains four main lobes. Each lobe is responsible for different functions.

The Brain The brain is very fragile and must be protected by the skull. The brain consists of two main hemispheres; right and left hemisphere. Each hemisphere is responsible for different aspects of human functioning. The grey matter that surround each hemisphere is known as the ‘Cerebral Cortex’

The Brain The corpus callosum is the white matter of the brain and it joins both hemispheres together. It is able to relay information between the hemispheres so that each hemisphere is aware of what the other is doing.

8.4 The Peripheral Nervous System SBI4UP MRS. FRANKLIN

The Peripheral Nervous System The Peripheral Nervous System connects organs, glands, muscles and senses to the CNS. Sensory neurons send information from the rest of the body to the CNS. The CNS sends information through the motor neurons to the rest of the body.

The sensory neurons relay information from the external environment to the CNS. The motor neurons relay information from the CNS to the skeletal muscles. Two types of Nerves: Cranial Nerves: Spinal Nerves: The Peripheral Nervous System

Nervous System Overview Nervous System Central Nervous System Peripheral Nervous System Brain Spinal CordSomatic Nerves Autonomic Nerves

The Peripheral Nervous System

The PNS can be subdivided into two main systems: Somatic System and Autonomic System. Somatic Nervous System: Autonomic Nervous System: The Peripheral Nervous System

The sympathetic and parasympathetic systems are associated with the flight-or-fight response and rest- and-digest response. Sympathetic System: Parasympathetic System: The Peripheral Nervous System Peripheral Nervous System Somatic Nerves Autonomic Nerves SympatheticParasympathetic

Textbook: pg. 373 # 1, 2, 4, 5, 7, 8 & 9 Homework

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